Nonenzymatic RNA copying with a potentially primordial genetic alphabet
Ziyuan Fang, Xiwen Jia, Yanfeng Xing, Jack W. Szostak
This paper investigates a primordial genetic alphabet using 2-thiouridine (s2U), 2-thiocytidine (s2C), inosine (I), and adenine (A), showing that their base pairs are isoenergetic and isomorphic, enabling balanced nucleotide incorporation in nonenzymatic RNA copying.
Proceedings of the National Academy of Sciences · May 21, 2025Peer-reviewedBiochemistry